Simpson Strong-Drive SDWH TIMBER-HEX Stainless Steel Screw (0.275" x 5") is a heavy-duty structural fastener engineered as a direct replacement for traditional lag screws in wood-framing applications. Built from Type 316 stainless steel, this hex-head screw delivers outstanding corrosion resistance in saltwater, coastal, chemical-exposure, and other harsh outdoor environments where standard carbon steel fasteners would degrade. The sharp point and purpose-built box thread design allow the screw to drive directly into wood without predrilling in most applications, saving significant time and labor on the job site. It meets both 2018 and 2021 IRC and IBC code requirements for several common wood-framing uses, making it a code-compliant choice for structural connections that demand long-term performance.

Key Features

• Type 316 Stainless Steel material and finish - provides maximum corrosion protection in saltwater, coastal, and chemically aggressive environments where lesser finishes fail prematurely
• No predrilling required in most applications - eliminates a preparation step compared to traditional lag screws, speeding up installation and reducing the tools needed on site
• Sharp point tip - starts and seats quickly in wood without walking or slipping, improving accuracy and driving efficiency
• Unique "box" thread design with raised-ridge technology - significantly reduces driving torque, making the screw easier to drive and reducing strain on the installer and the tool
• 1/2 in. Hex drive with included driver bit - works with standard hex impact drivers or drills, and the included bit means you can start work immediately without sourcing additional accessories
• Hex washer head (0.655 in. diameter) - provides a large bearing area that distributes load effectively across the wood surface, improving clamping force and connection integrity
• 3 in. thread length on a 5 in. shank - engineered thread engagement depth for secure grip in structural lumber without over-penetrating thin members
• Lag-screw replacement rated - approved for ledger and other common wood-framing applications under 2018 and 2021 IRC and IBC codes, giving contractors and inspectors the documentation they need

Why This Product

• Eliminates predrilling on most structural connections - compared to traditional lag screws that require a pilot hole, this screw's sharp point and low-torque box thread design allow direct installation, cutting labor time significantly on framing, ledger board, and timber connections
• Code-compliant for residential and commercial framing - meets 2018 and 2021 IRC and IBC requirements for several common wood-framing applications, so contractors can use it confidently on permitted projects without seeking special approvals
• Purpose-built for demanding outdoor and waterfront environments - Type 316 stainless steel resists corrosion from saltwater spray, pressure-treated lumber chemicals, and prolonged moisture exposure, making it well suited for decks, docks, ledgers, and coastal construction
• Ready to install out of the package - the included 1/2 in. hex driver bit means the right tool comes with the fastener, so installation can begin immediately without sourcing additional hardware

Specifications

• Brand: Simpson Strong-Tie
• Material: Type 316 Stainless Steel
• Finish: Type 316 Stainless Steel
• Length: 5 in.
• Shank Diameter: 0.275 in.
• Head Diameter: 0.655 in.
• Head Type: Hex Washer Head
• Drive Type: 1/2 in. Hex
• Thread Type: Box Threads
• Thread Length: 3 in.
• TPI: 7
• Point Type: Sharp Point
• Country of Origin: Taiwan

Available Pack Options

• SDWH27500SS-R10: 10 Pk - includes (1) driver bit
• SDWH27500SS-R50: 50 Pk - includes (1) driver bit

Frequently Asked Questions

Does this screw require predrilling before installation?

No predrilling is necessary in most applications. The sharp point tip and box thread design with raised-ridge technology allow the screw to be driven directly into wood, making installation faster and easier than traditional lag screws that require a pilot hole.

What makes Type 316 stainless steel different from standard fastener finishes?

Type 316 stainless steel offers maximum corrosion resistance, including protection against saltwater, coastal air, and chemical exposure. It is a more robust material choice than standard zinc or galvanized finishes for applications in harsh, wet, or marine environments where long-term structural integrity is critical.

Is this screw approved for use in ledger board applications and code-required framing?

Yes. These fasteners meet 2018 and 2021 IRC and IBC code requirements for several common wood-framing applications, including ledger connections. This makes them suitable for permitted residential and commercial framing projects where documented code compliance is required.

What drive tool is needed to install this screw?

This screw uses a 1/2 in. hex drive. A 1/2 in. hex impact driver or drill with a hex bit attachment is compatible. A driver bit is included with the product so installation can begin immediately without sourcing additional tooling.

Note: Product dimensions and/or thread length may differ from picture.